I have had a recent issue with my moggies, unfortunately Frontline (and it's active ingredient Fipronil) appears not to work any longer - apparently fleas have evolved and built up resistance! I then tried Advantage which has a different active ingredient, and used Indorex,as mentioned above, to spray the bedding etc. I also used fleabombs from Amazon to decontaminate the rooms... And Johnsons flea tablets (these can be used whenever you see fleas on your cat) Unfortunately the fleas are back! GAH! Highly recommend using Amazon or Pets UK for buying said products as they are much cheaper than in the pet store.